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The solubility product of a sparingly soluble salt AX2 is 3.2 × 10⁻¹¹. Its solubility (in moles/litre) is

1. 5.6 × 10⁻⁶
2. 3.1 × 10⁻⁴
3. 2 × 10⁻⁴
4. 4 × 10⁻⁴

Correct answer: 5.6 × 10⁻⁶

Solution

For a salt AX2, the solubility product (Ksp) is given by Ksp = 4s³, where s is the solubility. Solving 3.2 × 10⁻¹¹ = 4s³ gives s = 5.6 × 10⁻⁶ mol/L.

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